(a) Failure to meet the requirements of Code Sections 15-6-67 and 15-6-68 or the recording of an improper plat by the clerk shall not, in and of itself, affect or invalidate any legal description or legal instrument based on such plat.

(b) Nothing in Code Sections 15-6-67 and 15-6-68 shall be deemed to invalidate any map or plat made prior to July 1, 1978, nor shall anything in those Code sections be deemed to require the clerk of the court to prepare or maintain a record of each individual land lot for any plat of survey recorded in the clerk's office prior to July 1, 1978.